Sealing low-temperature butterfly valve and sealing method thereof

Abstract

The invention relates to the technical field of low-temperature butterfly valve devices, in particular to a sealing low-temperature butterfly valve and a sealing method thereof.The sealing low-temperature butterfly valve comprises a valve body, a butterfly plate is arranged on the inner side of the valve body, the top end of the butterfly plate is in transmission connection with a driving assembly, and a fixing ring is fixed to the inner side wall of the valve body; the butterfly plate comprises an inner plate, an auxiliary frame fixed to one side of the inner plate, a pressing plate fixed to the front end of the inner plate and a rotating shaft fixed to the top end of the auxiliary frame, the driving assembly comprises a fixing frame, a flange is fixed to the bottom end of the fixing frame, a positioning column is fixed to the top end of the flange, and a positioning groove is formed in the side wall of the positioning column; the internal valve plate sealing ring structure is made of rubber, the leakage problem of a sealing face caused by thermal expansion and cold contraction can be effectively solved, a fixed ring structure is matched, a certain distance can be kept at any time when the internal butterfly plate rotates, a sleeve frame and a fixed ring are in contact during sealing, an all-metal sleeve frame structure replaces the design of an existing single sealing ring, and the sealing effect is good. The use in a low-temperature environment is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic butterfly valve devices, and in particular to a sealed cryogenic butterfly valve and a sealing method thereof. Background Art

[0002] The development of low-temperature butterfly valves is the trend of butterfly valve technology development. This type of valve is usually used on extremely important pipelines in industrial production systems, and the design requirements of the valve are very strict.

[0003] In the Chinese patent application number: CN201610038554.X, a hard-sealed low-temperature butterfly valve and its sealing method are introduced, in which the corresponding gap t is maintained when the sealing ring is free. Tightening the screws completely compresses the gap t, and the small C-shaped sealing ring is also completely pressed, ensuring the sealing performance of the valve seat. The gap between the large C-shaped sealing ring and the sealing pressure ring is also t, so after the butterfly plate and the sealing ring are tightly matched, the large C-shaped sealing ring is not subject to the compression force of the sealing pressure ring and can rebound freely, achieving the purpose of the predetermined preload;

[0004] When this structure is used, butterfly valves working at room temperature often use metal-non-metal sealing pairs. However, under low temperature conditions, since the expansion coefficient of non-metallic materials is much larger than that of metal materials, the shrinkage amount of non-metallic materials at low temperatures is very different from that of metal seals, valve bodies and other matching parts, resulting in a serious reduction in the sealing pressure, which easily leads to sealing failure. In addition, most non-metallic materials become hard and brittle at cryogenic temperatures, and lose toughness, which leads to problems of cold flow and stress relaxation. Summary of the invention

[0005] Technical issues solved

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a sealed low-temperature butterfly valve and a sealing method thereof, wherein the flange is connected and fixed to the positioning column, and a positioning groove structure is provided on the outer side of the positioning column, and the positioning groove can be fixed with the protrusion on the transmission frame, so when the rotating rod rotates, the transmission frame-protrusion-positioning column (positioning groove) can be driven to rotate, and the positioning column can drive the flange at the bottom to rotate, and then drive the rotating shaft to rotate. During the rotation of the transmission frame, the pin shaft at the other end can drive the telescopic rod to be locked inwardly through the sleeve ring. Therefore, when the device is in use, the effort of opening the butterfly valve can be saved, and the deflection angle can be fixed by the telescopic gas rod on one side, so as to facilitate the adjustment of the opening angle of the butterfly plate; by fixing a pressure plate structure on the outer side of the butterfly plate, the sleeve frame in the pressure plate can fix the valve plate sealing ring to the outer side of the butterfly plate. The frame is made of metal, and the internal valve plate sealing ring structure is made of rubber. Therefore, in actual use, the leakage problem of the sealing surface caused by thermal expansion and contraction can be effectively reduced. With the fixed ring structure, when the internal butterfly plate rotates, a certain distance can be maintained at all times. When sealed, the sleeve frame and the fixed ring can be contacted to achieve a sealed effect. The all-metal sleeve frame structure replaces the existing single sealing ring design, which is convenient for use in low temperature environments. It can effectively solve the problem in the prior art that the expansion coefficient of non-metallic materials is much larger than that of metal materials, so that the shrinkage at low temperature is very different from the shrinkage of metal seals, valve bodies and other matching parts, thereby causing a serious reduction in the sealing specific pressure, which easily leads to the failure of the seal and the hardening and brittleness of non-metallic materials at cryogenic temperatures, losing toughness, thereby causing cold flow and stress relaxation.

[0007] Technical Solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] The present invention provides a sealed low-temperature butterfly valve, comprising a valve body, a butterfly plate is arranged on the inner side of the valve body, the top end of the butterfly plate is transmission-connected with a driving assembly, a fixing ring is fixed on the inner side wall of the valve body, the butterfly plate comprises an inner plate, an auxiliary frame fixed to one side of the inner plate, a pressure plate fixed to the front end of the inner plate and a rotating shaft fixed to the top end of the auxiliary frame, the driving assembly comprises a fixing frame, a flange is fixed to the bottom end of the fixing frame, a positioning column is fixed to the top end of the flange, a positioning groove is provided on the side wall of the positioning column, a transmission frame is sleeved on the outer side of the positioning column, one side of the transmission frame is sleeved and fixed with a rotating rod, a pin is fixed on the middle part of the other side, and a telescopic rod is sleeved on the outer side of the pin, the telescopic rod is fixed in the fixing frame, a groove structure is opened inwardly at the outer edge of the inner plate, and a pressure plate is fixed in the groove body, the pressure plate comprises a valve plate sealing ring and a sleeve frame sleeved on the outer side of the valve plate sealing ring, the pressure plate is fixed in the inner plate by fastening bolts, and the top end of the rotating shaft is fixedly connected with the flange.

[0010] Furthermore, the valve body is a hollow cavity structure with no faces on both sides, and the cross-section of the fixing ring is a trapezoidal structure, and the side with the inclined surface is arranged on the opening and closing side of the butterfly plate, and the ring diameter size of the fixing ring is adapted to the spacing size between the butterfly plate and the valve body; the flange is connected and fixed to the positioning column, and a positioning groove structure is provided on the outer side of the positioning column, and the positioning groove can be fixed with the protrusion on the transmission frame, so when the rotating rod rotates, the transmission frame-protrusion-positioning column (positioning groove) can be driven to rotate, and the positioning column can drive the flange at the bottom end to rotate, and then drive the rotating shaft to rotate. During the rotation of the transmission frame, the pin shaft at the other end can drive the telescopic rod to be locked inward through the sleeve ring.

[0011] Furthermore, the fixing frame is a frame structure, and a groove structure is penetrated through the bottom end of the transmission frame, and a protrusion structure is arranged on the inner wall of the groove, and the protrusion structure is clamped in the positioning groove.

[0012] Furthermore, a sleeve is fixed to the top of the transmission frame, a cylindrical pin is fixed to the top of the sleeve, and a circular hole is opened at the top of the fixing frame, an L-shaped limit plate is fixed at the top of the circular hole, an arc-shaped arc groove is opened on the inner side of the limit plate, and the cylindrical pin is clamped in the arc groove, and the bottom end of the fixing frame is fixed to the top of the valve body.

[0013] Furthermore, the auxiliary frame is a structure of multiple groups of mounting plates and outer plates fixed to the mounting plates, and each group of mounting plates is equidistantly installed on the inner side of the inner plate, and the size of the outer plate is smaller than that of the pressure plate. Since the sleeve frame is made of metal and the internal valve plate sealing ring structure is made of rubber, the leakage problem of the sealing surface caused by thermal expansion and contraction can be effectively reduced in actual use. In conjunction with the fixed ring structure, a certain distance can be maintained at all times when the internal butterfly plate rotates.

[0014] Furthermore, the sleeve frame is a metal structure, the valve plate sealing ring is a rubber ring structure, and a circular hole groove structure is penetrated through the middle of the sleeve frame and the valve plate sealing ring, and the fastening bolt is fixed in the circular hole groove.

[0015] Furthermore, a sleeve ring structure is fixed to the output end of the telescopic rod, and the sleeve ring is arranged on the outside of the pin shaft, so in actual use, the effort of opening the butterfly valve can be saved, and the deflection angle can be fixed by the telescopic gas rod on one side, which is convenient for adjusting the opening angle of the butterfly plate.

[0016] Furthermore, the thickness of the sleeve frame is adapted to the thickness of the inner panel.

[0017] A sealing method for sealing a cryogenic butterfly valve, the specific method is as follows:

[0018] S1: Assemble and connect the valve sealing ring in the pressure plate with the sleeve frame, and then connect and fix the pressure plate with the butterfly plate by tightening bolts;

[0019] S2: Connect and fix the flange to the rotating shaft;

[0020] S3, the transmission frame is rotated by the rotating rod, and then the transmission frame is rotated through the sleeve, and after the protrusion in the sleeve is fixed with the positioning groove of the positioning column, the butterfly plate at the bottom can be driven to rotate through the positioning column-flange-rotating shaft, and the pressure plate structure fixed in S1 can contact the outer wall of the fixing ring during sealing to maintain a sealed state at all times;

[0021] S4, during the rotation of the transmission frame, the output end of the telescopic rod can be driven to compress inward, and the cylindrical pin at the top can rotate in the arc groove to improve the stability of the rotation.

[0022] Beneficial Effects

[0023] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0024] 1. The present invention provides a driving assembly, in which a flange is connected and fixed to a positioning column, and a positioning groove structure is opened on the outer side of the positioning column. The positioning groove can be fixed with the protrusion on the transmission frame. Therefore, when the rotating rod rotates, the transmission frame-protrusion-positioning column (positioning groove) can be driven to rotate, and the positioning column can drive the flange at the bottom to rotate, and then drive the rotating shaft to rotate. During the rotation of the transmission frame, the pin shaft at the other end can drive the telescopic rod to be locked inward through the sleeve ring. Therefore, when the device is in use, it can save the effort to open the butterfly valve, and the deflection angle can also be fixed by the telescopic gas rod on one side, so as to facilitate the adjustment of the opening angle of the butterfly plate.

[0025] 2. In this device, a pressure plate structure is fixed on the outer side of the butterfly plate, and the sleeve frame in the pressure plate can fix the valve plate sealing ring to the outer side of the butterfly plate. Since the sleeve frame is made of metal and the internal valve plate sealing ring structure is made of rubber, the leakage problem of the sealing surface caused by thermal expansion and contraction can be effectively reduced in actual use. With the fixed ring structure, when the internal butterfly plate rotates, a certain distance can be maintained at all times. When closed, the sleeve frame can contact the fixed ring to achieve a closed effect. The all-metal sleeve frame structure replaces the existing single sealing ring design, which is convenient for use in low temperature environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is one of the structural schematic diagrams of the present invention;

[0028] Figure 2 This is the second structural schematic diagram of the present invention;

[0029] Figure 3 It is a structural breakdown diagram of the present invention;

[0030] Figure 4 This is a structural breakdown diagram of the drive assembly in the present invention;

[0031] Figure 5 It is a structural cross-sectional view of the valve body in the present invention;

[0032] Figure 6 for Figure 5 The structural diagram at A in the middle;

[0033] Figure 7 It is a structural disassembly diagram of the pressing plate of the present invention;

[0034] Figure 8 This is a structural disassembly diagram of the valve plate sealing ring and the sleeve frame of the present invention;

[0035] Fig. 9 It is a schematic structural diagram of the fixing frame and the sleeve of the present invention.

[0036] The numbers in the figure represent: 1, valve body; 11, fixing ring; 2, butterfly plate; 21, inner plate; 211, auxiliary frame; 22, rotating shaft; 23, pressure plate; 231, valve plate sealing ring; 232, sleeve frame; 233, fastening bolts; 3, driving assembly; 31, fixing frame; 311, limit plate; 312, arc groove; 32, flange; 33, positioning column; 331, positioning groove; 34, transmission frame; 341, protrusion; 35, sleeve; 351, cylindrical pin; 36, telescopic rod; 37, rotating rod. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The present invention will be further described below in conjunction with the embodiments.

[0039] Embodiment 1: A sealed low temperature butterfly valve, refer to the attached Figure 1 -Attached Fig. 9, including a valve body 1, a butterfly plate 2 is arranged on the inner side of the valve body 1, the top of the butterfly plate 2 is transmission-connected with a driving assembly 3, a fixing ring 11 is fixed on the inner wall of the valve body 1, the butterfly plate 2 includes an inner plate 21, an auxiliary frame 211 fixed to one side of the inner plate 21, a pressure plate 23 fixed to the front end of the inner plate 21 and a rotating shaft 22 fixed to the top of the auxiliary frame 211, the driving assembly 3 includes a fixing frame 31, a flange 32 is fixed to the bottom end of the fixing frame 31, a positioning column 33 is fixed to the top end of the flange 32, and a positioning groove 331 is opened on the side wall of the positioning column 33, A transmission frame 34 is sleeved on the outer side of the positioning column 33, one side of the transmission frame 34 is sleeved and fixed with the rotating rod 37, a pin is fixed in the middle of the other side, and a telescopic rod 36 is sleeved on the outer side of the pin, and the telescopic rod 36 is fixed in the fixing frame 31, a groove structure is opened inward at the outer edge of the inner plate 21, and a pressure plate 23 is fixed in the groove, the pressure plate 23 includes a valve plate sealing ring 231 and a sleeve frame 232 sleeved on the outer side of the valve plate sealing ring 231, the pressure plate 23 is fixed in the inner plate 21 by fastening bolts 233, and the top end of the rotating shaft 22 is fixedly connected to the flange 32;

[0040] The valve body 1 is a hollow cavity structure with no faces on both sides, and the cross-section of the fixing ring 11 is a trapezoidal structure, and the side with the bevel is arranged on the opening and closing side of the butterfly plate 2. The ring diameter size of the fixing ring 11 is adapted to the spacing size between the butterfly plate 2 and the valve body 1. The fixing frame 31 structure is fixedly connected to the external structure, and a certain offset angle is left at the front end of the fixing frame 31. The usage method can also be changed according to current requirements. The user can use one side of the telescopic rod 36 as the power end, and the output end of the telescopic rod 36 and the sleeve rod drive the pin shaft to deflect, and rotate through the protrusion 341-positioning groove 331 to realize power transmission. Therefore, the power end of the device can be replaced as required to achieve different usage effects.

[0041] At the same time, the fixed frame 31 is a frame structure, and a groove structure is penetrated through the bottom end of the transmission frame 34, and a protrusion 341 structure is arranged on the inner wall of the groove body. The protrusion 341 structure is clamped in the positioning groove 331, and the protrusion 341 is clamped and fixed with the positioning groove 331 to realize power transmission at the upper and lower ends.

[0042] Moreover, a sleeve 35 is fixed to the top of the transmission frame 34, a cylindrical pin 351 is fixed to the top of the sleeve 35, and a circular hole is opened at the top of the fixing frame 31, and an L-shaped limiting plate 311 is fixed to the top of the circular hole, and an arc-shaped arc groove 312 is opened on the inner side of the limiting plate 311, and the cylindrical pin 351 is clamped in the arc groove 312, and the bottom end of the fixing frame 31 is fixed to the top of the valve body 1. The L-shaped limiting plate 311 structure can be clamped with the cylindrical pin 351 through the arc groove 312 structure therein, so as to improve the structural stability during rotation and reduce shaking.

[0043] The auxiliary frame 211 is a structure of multiple groups of mounting plates and outer plates fixed to the mounting plates, and each group of mounting plates is equidistantly mounted on the inner side of the inner plate 21 , and the size of the outer plates is smaller than that of the pressure plate 23 .

[0044] The sleeve frame 232 is a metal structure, the valve plate sealing ring 231 is a rubber ring structure, and the middle parts of the sleeve frame 232 and the valve plate sealing ring 231 are penetrated by a circular hole groove structure, and the fastening bolt 233 is fixed in the circular hole groove; the sleeve frame 232 in the pressure plate 23 can fix the valve plate sealing ring 231 to the outside of the butterfly plate 2. Since the sleeve frame 232 is made of metal and the internal valve plate sealing ring 231 structure is made of rubber material, in actual use, the leakage problem of the sealing surface caused by thermal expansion and contraction can be effectively reduced. In conjunction with the structure of the fixing ring 11, a certain distance can be maintained at all times when the internal butterfly plate 2 rotates.

[0045] The output end of the telescopic rod 36 is fixed with a sleeve ring structure, and the sleeve ring is arranged on the outer side of the pin shaft; through the set driving component 3, the flange 32 therein is connected and fixed with the positioning column 33, and a positioning groove 331 structure is opened on the outer side of the positioning column 33, and the positioning groove 331 can be fixed with the protrusion 341 on the transmission frame 34, so when the rotating rod 37 rotates, it can drive the transmission frame 34-protrusion 341-positioning column 33 (positioning groove 331) to rotate, and the positioning column 33 can drive the flange 32 at the bottom end to rotate, and then drive the rotating shaft 22 to rotate. During the rotation of the transmission frame 34, the pin shaft at the other end can drive the telescopic rod 36 to be locked inwardly through the sleeve ring. Therefore, when the device is in use, it can save the effort to open the butterfly valve, and the deflection angle can also be fixed by the telescopic gas rod on one side, so as to facilitate the adjustment of the opening angle of the butterfly plate 2.

[0046] The thickness of the sleeve 232 is adapted to the thickness of the inner plate 21; by fixing a pressure plate 23 structure on the outer side of the butterfly plate 2, the sleeve 232 in the pressure plate 23 can fix the valve plate sealing ring 231 to the outer side of the butterfly plate 2. Since the sleeve 232 is made of metal and the internal valve plate sealing ring 231 structure is made of rubber, the leakage problem of the sealing surface caused by thermal expansion and contraction can be effectively reduced in actual use. In conjunction with the fixed ring 11 structure, when the internal butterfly plate 2 rotates, a certain distance can be maintained at all times. When sealed, the sleeve 232 can contact the fixed ring 11 to achieve a sealed effect. The all-metal sleeve 232 structure replaces the existing single sealing ring design, which is convenient for use in low temperature environments.

[0047] Embodiment 2: The present invention also introduces a sealing method, including the sealing butterfly valve in embodiment 1

[0048] The specific method is as follows:

[0049] S1: Assemble and connect the valve sealing ring in the pressure plate with the sleeve frame, and then connect and fix the pressure plate with the butterfly plate by tightening bolts;

[0050] S2: Connect and fix the flange to the rotating shaft;

[0051] S3, the transmission frame is driven to rotate by the rotating rod, and then the transmission frame is rotated through the sleeve, and after the protrusion in the sleeve is fixed with the positioning groove of the positioning column, the butterfly plate at the bottom can be driven to rotate through the positioning column-flange-rotating shaft;

[0052] S4, during the rotation of the transmission frame, the output end of the telescopic rod can be driven to compress inward, and the cylindrical pin at the top can rotate in the arc groove to improve the stability of the rotation.

[0053] According to the method in this embodiment, in actual use, compared with the existing device, the leakage problem of the sealing surface caused by thermal expansion and contraction can be effectively reduced. With the structure of the fixed ring 11, when the internal butterfly plate 2 rotates, a certain distance can be maintained at all times. When sealed, the sleeve frame 232 can contact the fixed ring 11 to achieve a sealed effect.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealed low temperature butterfly valve, characterized in that: The invention comprises a valve body (1), wherein a butterfly plate (2) is arranged on the inner side of the valve body (1), wherein the top end of the butterfly plate (2) is drivingly connected to a driving assembly (3), wherein a fixing ring (11) is fixed on the inner side wall of the valve body (1), wherein the butterfly plate (2) comprises an inner plate (21), an auxiliary frame (211) fixed to one side of the inner plate (21), a pressure plate (23) fixed to the front end of the inner plate (21), and a rotating shaft (22) fixed to the top end of the auxiliary frame (211), wherein the driving assembly (3) comprises a fixing frame (31), wherein a flange (32) is fixed to the bottom end of the fixing frame (31), wherein a positioning column (33) is fixed to the top end of the flange (32), wherein a positioning groove (33) is provided on the side wall of the positioning column (33) 31), a transmission frame (34) is sleeved on the outer side of the positioning column (33), one side of the transmission frame (34) is sleeved and fixed with a rotating rod (37), a pin is fixed in the middle of the other side, and a telescopic rod (36) is sleeved on the outer side of the pin, and the telescopic rod (36) is fixed in the fixing frame (31), a groove structure is opened inward at the outer edge of the inner plate (21), and a pressure plate (23) is fixed in the groove, the pressure plate (23) includes a valve plate sealing ring (231) and a sleeve frame (232) sleeved on the outer side of the valve plate sealing ring (231), the pressure plate (23) is fixed in the inner plate (21) by fastening bolts (233), and the top end of the rotating shaft (22) is fixedly connected to the flange (32).

2. A sealed cryogenic butterfly valve according to claim 1, characterized in that: The valve body (1) is a hollow cavity structure without faces on both sides, and the cross-section of the fixing ring (11) is a trapezoidal structure, and the side with the inclined surface is arranged on the opening and closing side of the butterfly plate (2), and the ring diameter size of the fixing ring (11) is compatible with the spacing size between the butterfly plate (2) and the valve body (1).

3. A sealed cryogenic butterfly valve according to claim 1, characterized in that: The fixing frame (31) is a frame structure, and a slot structure is provided through the bottom end of the transmission frame (34), and a protrusion (341) structure is provided on the inner wall of the slot, and the protrusion (341) is clamped in the positioning slot (331).

4. A sealed low temperature butterfly valve according to claim 1, characterized in that: A sleeve (35) is fixed to the top of the transmission frame (34), a cylindrical pin (351) is fixed to the top of the sleeve (35), a circular hole is provided at the top of the fixing frame (31), an L-shaped limit plate (311) is fixed to the top of the circular hole, an arc-shaped groove (312) is provided on the inner side of the limit plate (311), and the cylindrical pin (351) is clamped in the arc-shaped groove (312), and the bottom end of the fixing frame (31) is fixed to the top of the valve body (1).

5. A sealed cryogenic butterfly valve according to claim 4, characterized in that: The auxiliary frame (211) is a structure of multiple groups of mounting plates and outer plates fixed to the mounting plates, and each group of mounting plates is equidistantly mounted on the inner side of the inner plate (21), and the size of the outer plates is smaller than the size of the pressure plate (23).

6. A sealed low temperature butterfly valve according to claim 1, characterized in that: The sleeve frame (232) is a metal structure, the valve plate sealing ring (231) is a rubber ring structure, and a circular hole groove structure is penetrated through the middle of the sleeve frame (232) and the valve plate sealing ring (231), and the fastening bolt (233) is fixed in the circular hole groove.

7. A sealed low temperature butterfly valve according to claim 1, characterized in that: A sleeve ring structure is fixed to the output end of the telescopic rod (36), and the sleeve ring is arranged on the outside of the pin shaft.

8. A sealed cryogenic butterfly valve according to claim 1, characterized in that: The thickness of the sleeve frame (232) is adapted to the thickness of the inner plate (21).

9. A sealing method for sealing a cryogenic butterfly valve, characterized in that: A sealed low-temperature butterfly valve comprising any one of claims 1 to 8, wherein the specific method is as follows: S1: Assemble and connect the valve sealing ring in the pressure plate with the sleeve frame, and then connect and fix the pressure plate with the butterfly plate by tightening bolts; S2: Connect and fix the flange to the rotating shaft; S3, the transmission frame is driven to rotate by the rotating rod, and then the transmission frame is rotated through the sleeve, and after the protrusion in the sleeve is fixed with the positioning groove of the positioning column, the butterfly plate at the bottom can be driven to rotate through the positioning column-flange-rotating shaft; S4, during the rotation of the transmission frame, the output end of the telescopic rod can be driven to compress inward, and the cylindrical pin at the top can rotate in the arc groove to improve the stability of the rotation.

Images